Macro Sensors LVDT Accessories: Core Connecting Rod

Core Connecting Rod Design

Diameter “D”, Threads “T” and “TT”, and Null Point “N” are from the table below:

LVDT Series	Rod Diameter (nom)		Thread	Tapping*	Set Screw	Null
	D	D	T	TT	SS	N
CD 375	0.110	7/64	4-40 UNC	1-72 UNF	1-72 X 3/8	1/2 H
DC 750	0.188	3/16	10-32 UNF	4-40 UNC	4-40 X 1/2	DATA
E 750	0.188	3/16	10-32 UNF	4-40 UNC	4-40 X 1/2	1/2 H
HLR 750	0.188	3/16	10-32 UNF	4-40 UNC	4-40 X 1/2	DATA
HSA 750	0.188	3/16	10-32 UNF	4-40 UNC	4-40 X 1/2	DATA
HSTA 750	0.188	3/16	10-32 UNF	4-40 UNC	4-40 X 1/2	DATA
HSAR 750	0.188	3/16	10-32 UNF	4-40 UNC	4-40 X 1/2	DATA
HSTAR 750	0.188	3/16	10-32 UNF	4-40 UNC	4-40 X 1/2	DATA
HSD 750	0.188	3/16	10-32 UNF	4-40 UNC	4-40 X 1/2	DATA
HSI 750	0.188	3/16	10-32 UNF	4-40 UNC	4-40 X 1/2	DATA
HSDR 750	0.188	3/16	10-32 UNF	4-40 UNC	4-40 X 1/2	DATA
HSI 750	0.188	3/16	10-32 UNF	4-40 UNC	4-40 X 1/2	Call Factory
PR 750	0.250	1/4	1/4-28 UNF	6-40 UNF	6-40 X 1/2	DATA
HT 750	0.250	1/4	1/4-28 UNF	6-40 UNF	6-40 X 1/2	DATA
PR 812	0.250	1/4	1/4-28 UNF	6-40 UNF	6-40 X 1/2	DATA
PRDC 812	0.250	1/4	1/4-28 UNF	6-40 UNF	6-40 X 1/2	Call Factory
PRH 812	0.250	1/4	1/4-28 UNF	6-40 UNF	6-40 X 1/2	1/2 H
PRS 812	0.250	1/4	1/4-28 UNF	6-40 UNF	6-40 X 1/2	1/2 H
PTI 750	0.188	3/16	10-32 UNF	4-40 UNC	4-40 X 1/2	DATA
SQ 500	0.110	7/64	4-40 UNC	1-72 UNF	1-72 X 3/8	1/2 H
SQ 1250	0.250	1/4	1/4-28 UNF	6-40 UNF	6-40 X 1/2	DATA

* For class 2 threads, 1-72 tap drill: #53; 4-40 tap drill: #44; 6-40 tap drill: #34


Recommended LVDT Core Connecting Rod Design Prepared by Harold Schaevitz		Core rod material must be non-magnetic, preferably 300 series (18-8) stainless steel. Thread 18-8 stainless steel socket set screw (SS) into tapped hole “TT” with Loctite; Then thread set screw projecting from core rod assembly into LVDT core. All dimensions in inches; ext. threads are class 2A; int. threads are class 2B connection / adjustment length “LL” is selected to suit the LVDT installation. Minimum unthreaded rod length “L” is derived from the formula below: L=N+R-C/2 Where: N is null point of the LVDT from its data sheet or table below R is the range of the LVDT depicted in its model number D is the length of the LVDT core from its data sheet H is the length of the LVDT case from its data sheet. Diameter “D”, Threads “T” and “TT”, and Null Point “N” are from the table below.
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